RT Journal Article
T1 Antiproton signatures from astrophysical and dark matter sources at the galactic center
A1 Ruiz Cembranos, José Alberto
A1 Gammaldi, Viviana
A1 López Maroto, Antonio
AB The center of our Galaxy is a complex region characterized by extreme phenomena. The presence of the supermassive Sagittarius A* black hole, a high dark matter density and an even higher baryonic density are able to produce very energetic processes. Indeed, high energetic gamma-rays have been observed by different telescopes, although their origin is not clear. In this work, we estimate the possible antiproton flux component associated with this signal. The expected secondary astrophysical antiproton background already saturates the observed data. It implies that any other important astrophysical source leads to an inconsistent excess. We estimate the sensitivity of PAMELA to this new primary antiproton source, which depends on the diffusion model and its spectral features. In particular, we consider antiproton spectra described by a power-law, a monochromatic signal and a Standard Model particle-antiparticle channel production. This latter spectrum is typical in the production from annihilating or decaying dark matter. We pay particular attention to the case of a heavy dark matter candidate, which could be associated with the High Energy Stereoscopic System (HESS) data observed from the J1745-290 source.
PB IOP Publishing
SN 1475-7516
YR 2015
FD 2015-03
LK https://hdl.handle.net/20.500.14352/24125
UL https://hdl.handle.net/20.500.14352/24125
LA eng
NO © 2015 IOP Publishing Ltd and Sissa Medialab srl. This work has been supported by UCM predoctoral grant, MICINN (Spain) project numbers FIS 2008-01323, FIS2011-23000, FPA2011-27853-01, Consolider-Ingenio MULTIDARK CSD2009-00064, and the Department of Energy, Contract DE-AC02-76SF00515.
NO Ministerio de Ciencia e Innovación (MICINN), España
NO Consolider-Ingenio MULTIDARK
NO U.S. Department of Energy Office of Science  (EE.UU)
NO Universidad Complutense de Madrid (UCM)
NO Ministerio de Economía y Competitividad (MINECO), España
DS Docta Complutense
RD 10 abr 2025